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Britax Grow With You ClickTight Harness-2-Booster Car Seat

A harness-to-booster seat with 2 modes: forward-facing harness 30 to 65 lb, 35 to 49 in; belt-positioning booster 40 to 120 lb, 44 to 63 in.

At a glance

Fits children from 30 to 120 lb
Up to 63 in tall
2 modes: forward-facing harness, belt-positioning booster
Seat weighs 25 lb
9-year usable life
Certified for aircraft use

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Britax product page Manual

Specifications checked against Britax’s US site and manual on September 17, 2026. Not hands-on tested. How I research

Who the Grow With You ClickTight Harness-2-Booster Car Seat fits

This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Britax gives it a 9-year life from the date of manufacture, so check the date label before using a hand-me-down.

Forward-facing harness30 to 65 lb · 35 to 49 in · from 2 years: The child faces forward in the seat’s own harness. Use the top tether every time, and stay in the harness until the child outgrows it.
Belt-positioning booster40 to 120 lb · 44 to 63 in: The seat raises the child so the vehicle’s own lap and shoulder belt sits on the hips and across the shoulder. The child has to sit properly for the whole ride.

A school-age child with a backpack beside an empty high-back booster

What are the Grow With You ClickTight Harness-2-Booster Car Seat weight, height and age limits?

Britax Grow With You ClickTight Harness-2-Booster Car Seat limits by mode
Mode	Child weight	Child height	Minimum age	Conditions
Forward-facing harness	30 to 65 lb	35 to 49 in	2 years	At least 2 years (manual); lower anchor installation limited to 40 lb (manual); upright position required above 40 lb
Belt-positioning booster	40 to 120 lb	44 to 63 in	Not published	Upright position only (manual)

A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.

Grow With You ClickTight Harness-2-Booster Car Seat specifications

Seat weight: 25 lb
Width: Not published
Usable life: 9 years
Aircraft use: Certified for aircraft (see manual for which modes)
Dimensions as stated: 21" x 19" x 25"
Harness positions: 9
Recline positions: 2
Harness slot height range: 12 to 20 in
Buckle strap depth range: 7 to 9 in
Seat area depth: 15 in
Seat area width: 12 in

How the Grow With You ClickTight Harness-2-Booster Car Seat installs

Belt lock-off: ClickTight installation. A lock-off clamps the vehicle belt so you do not have to switch the belt's retractor into its locked mode.
Recline: 2 recline positions. The recline angle is what keeps a young baby’s airway open, so set it before tightening the install.
Harness: 9-position no-rethread harness and headrest. Check the harness height at each growth spurt: at or below the shoulders rear-facing, at or above them forward-facing.

Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.

An empty car seat installed on a back seat, seen through an open car door

Will it fit your car?

Britax does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying. It weighs 25 lb, which matters if you will move it between cars or carry it through an airport.

Check your vehicle manual for lower anchor positions and any head-restraint rules.
Rear-facing seats need front-seat room: try the install behind the driver before you commit.
Certified for aircraft use, so it can travel as a seat rather than checked baggage.

What features does the Grow With You ClickTight Harness-2-Booster Car Seat have?

ClickTight installation
9-position no-rethread harness and headrest
2 recline positions
V-shaped tether
SafeCell technology
High-strength steel frame

Colors listed in the US

Black Contour, Grey Contour, Green Contour, Cool Flow Grey, Cool N Dry.

Is the Grow With You ClickTight Harness-2-Booster Car Seat recalled?

No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.

NHTSA recall search · Recent car seat recalls

Before you buy

Weigh and measure your child. The limits above are the manufacturer’s, and a child has to meet all of them for the mode they will use.
Confirm the exact version. Colors, retail exclusives and model numbers change limits more often than you would expect; Britax lists 5 colors of this seat.
Read the manual before you buy, not after. It is linked above and holds the fit rules, the install methods and the expiry.
Check recalls by model number and date of manufacture, and register the seat with Britax so you hear about the next one.

Sources

Other Britax booster seats

Model	Top child weight	Seat weight	Width	Usable life
Grow With You ClickTight Harness-2-Booster Car Seat (this seat)	120 lb	25 lb	—	9 years
Grow With You Harness-2-Booster Car Seat	120 lb	23 lb	—	9 years
Highpoint 2-Stage Belt-Positioning Booster	120 lb	12 lb	—	10 years
Skyline 2-Stage Belt-Positioning Booster	120 lb	11 lb	—	10 years
UpNGo Backless Booster Seat	120 lb	3.1 lb	17.1 in	10 years
UpNGo Click Backless Booster Seat	120 lb	4.5 lb	17.1 in	10 years